I think John K can confirm the detuning of the cam
of the later (post '76) cams
The pistons from a '76 (flat top) fit exactly the same as any
other Spit piston (model specific)
I put flattop piston is Whitey ('75) without thinking twice about
it. Yep... just the piston dish difference.
The idea (for one year anyway) was to burn it hotter
along with all the various vacuum controls and throttle
activated EGR control and the like to try and burn
more effectively. ....obviously didn't
work as the cat. was added in '77 to clean up emissions
Paul Tegler
ptegler@cablespeed.com
www.teglerizer.com
----- Original Message -----
From: "Joe Guinan" <spitfirejoe@email.com>
To: <nass@yahoogroups.com>; <spitfire-enthusiast@yahoogroups.com>;
<spitfires@autox.team.net>
Sent: Thursday, January 03, 2002 6:06 PM
Subject: { NASS } 1500 engine differences?
> What are the differences between the 1976 (and earlier) 1500 engines and
the 1977 (and later) models. My understanding is that the later motors had
dished pistons and a lower compression ration, but almost everything else
was the same as the earlier engines. I am assuming there will be some
differences in anti-pollution fittings, etc. on the outside of the engine.
What I'm talking about are the internal differences. Are cams different?
Cranks? Bearings?
>
> Another guy and I are in the same boat. We have spare 1976 engines to put
in our later model Spits. We just want to know if we are going to be able
to drop them right in.
>
> Thanks in advance!
>
> Joe Guinan
> spitfirejoe@email.com
> --
>
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